DTC B1833: Short In Curtain Shield Airbag RH Squib Circuit (To +B)

Diagnosis start condition: 

Ignition voltage is 10 V to 16 V.

DTC detecting condition: 

• Curtain airbag harness RH is shorted to power supply.
• Curtain airbag module RH is faulty.
• Airbag control module is faulty.

Wiring diagram: 

Airbag system Refer to WIRING SYSTEM>AIRBAG SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK POOR CONTACT OF CONNECTORS. 

   Check for poor contact of the connectors between the airbag control module, curtain airbag module RH and the curtain airbag sensor RH.

   Is there poor contact?

   Yes: Replace the airbag rear harness along with body harness.

   No: Go to  2.

2. CHECK CURTAIN AIRBAG MODULE. 
   1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
   2. Disconnect the connector (AB33), and connect the connector (1N) in test harness N to connector (AB33).
   3. Connect the airbag resistor to the connector (2N) of test harness N.
   4. Connect the battery ground terminal and turn the ignition switch to ON.

   Does the airbag warning light illuminate for six seconds and go off?

   Yes: Replace the curtain airbag module RH. Refer to AIRBAG SYSTEM>CURTAIN AIRBAG MODULE .

   No: Go to  3.

3. CHECK AIRBAG REAR HARNESS (CURTAIN AIRBAG MODULE HARNESS RH). 
   1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
   2. Disconnect the connector (AB26) from seat belt pretensioner RH.
   3. Disconnect the connector (AB30) from the lap seat belt pretensioner RH.
   4. Disconnect the connector (AB24) from side airbag module RH.
   5. Disconnect the airbag resistor from test harness N.
   6. Disconnect the connectors (AB6, AB17, AB18) from airbag control module.
   7. Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18).
   8. Connect the battery ground terminal and turn the ignition switch to ON.
   9. Measure the voltage between connector (3AG) in the test harness AG and chassis ground.

      Connector & terminal 

      (3AG) No. 19 (+) - Chassis ground (-):

      (3AG) No. 17 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes: Go to  4.

   No: Replace the airbag rear harness along with body harness.

4. CHECK AIRBAG CONTROL MODULE. 
   1. Connect all connectors.
   2. Clear the memory. Refer to AIRBAG SYSTEM (DIAGNOSTICS)>CLEAR MEMORY MODE .
   3. Perform the Inspection Mode. Refer to AIRBAG SYSTEM (DIAGNOSTICS)>INSPECTION MODE .
   4. Read the DTC. (Current malfunction) Refer to AIRBAG SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1833 displayed?

   Yes: Replace the airbag control module. Refer to AIRBAG SYSTEM>AIRBAG CONTROL MODULE .

   No: Go to  5.

5. CHECK FOR ANY OTHER DTC ON DISPLAY. 

   Read the DTC. (Current malfunction) Refer to AIRBAG SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes: Perform the diagnosis for other displayed DTCs. Refer to AIRBAG SYSTEM (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   No: Finish the diagnosis.